Research And Development Of Intellectual Detecting System For Foundation Stone In River Channel Project

Many flood disasters often occur in our country, and abnormal climate leads to disasters frequently in recent years. Therefore, the task to take precaution against flood is more arduous. River department has devoted a great deal of manpower and material resources to the intellectual detecting technology for foundation stone in the Yellow River since 1980. But the problem can't be resolved thoroughly because of the difficulty in detecting through feculent water and silt seam, the particularity of stream current with much sandiness and limited detecting technology.On the analysis of the structure, loss mode, loss position, loss orientation and loss reason of foundation stone for protecting dam in river project, the condition to keep dam safe and steady is put forward in the paper. The detecting scope, requirement and goal of the intellectual detecting system for foundation stones in the Yellow River are confirmed according to the long-term normal hydrology situation.On the basis of analyzing the existing detecting technology, the ultrasonic instrument with high precision and penetrating power-StrataBox bathometer for feculent-water profile is employed in the experiment according to the technology requirement of intellectual detecting system for foundation stone in the Yellow River. A new type of detecting scheme-carrier on bank is put forward on the analysis of the detecting disadvantage of ship carrier, aeromodelling and underwater robot. Carrier and its related drive control system are designed, and the corresponding software system is developed as well. Furthermore, the detailed working course and time of detecting system is devised, too.The mathematics model of extension arm is established in the paper. With the combination of modern computer technology and mathematics method, the finite element software ANSYS is utilized to analyze the mechanic characteristics and optimize the structure of detecting extension arm, and the computer emulation and analysis, precision analysis and stability check are carried on at the same time, the purpose of which is to make each performance parameter optimum.The characteristics of the system are listed as follows by the comparative experiments of the detecting system on spot and the analysis of the dam scanning experimental data and image:(1) The system is of high detecting efficiency and penetrating ability, and it can measure the interface of foundation stone under feculent water and silt seam. And it can also distinguish the interface of silt seam and foundation stone more clearly according to the signal characteristic, being suitable for the measurement of foundation stone in the Yellow River.(2) The detecting precision is relatively high, with 63% of experimental results meeting the design requirement and the contrast error of 22.9% and artificial wimble detecting results within the allowable range.(3) The system can automatically store, manage the detecting data and results, directly outputting the sectional drawings and calculating the position and quantity of vacant stones.(4) The system is mobile, flexible and real-time, with simple installation and operation, friendly interface, complete and intuitionistic results.In a word, the subject of intellectual detecting system for foundation stone in the Yellow River meets the demand of current flood prevention project. It is an indispensable technical equipment to deal with flood emergency with high technique and practicability. Its implement will greatly improve the purpose and validity of flood prevention.